<!DOCTYPE html>
<html lang="zh">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>dom</title>
</head>
<body>
        <div>
                <div id="test"><span>test1</span>
                  <p class="red">段落标签3</p> test2
                </div>
                <div id="test2">
                  <p class="red">段落标签4</p> test2
                </div>
              </div>
            
              <div id="empty">
                <div class="red"></div>
                <div id="e2"></div>
                <div id="e3"></div>
              </div>
            
              <div id="siblings">
                <div id="s1"></div>
                <div id="s2"></div>
                <div id="s3"></div>
              </div>
              <div id="travel">
                <div id="t1">t1</div>
                <div id="t2">t2</div>
                <div id="t3">t3</div>
              </div>
        
    <script src="./dom.js"></script>
    <script src="./main.js"></script>
    
</body>
</html>